Error when activating the plugin

I get the following error when activating the plugin. What could be the problem? 2019/03/14 11:47:11 [error] 4624#0: *345 FastCGI sent in stderr: “PHP message: PHP Fatal error: Call to a member function get() on null in /home/learnalot/learnalot.com/wp-content/plugins/woo-download-credits-platinum/woo-download-credits-platinum.php on line 1102” while reading response header from upstream, client: 49.206.242.33, server: learnalot.com, request: “GET /wp-admin/ HTTP/1.1”, … Continue reading Error when activating the plugin